Fig. 2
Pore-scale molecular composition of water-soluble organic carbon collected after rewetting incubation from different pore size suction domains. The relative abundance of Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometry defined organic carbon compound classes (lipids, unsaturated hydrocarbons, lignin, proteins, and so on) for soil pore water collected at −1.5, −15, and −50 kPa suctions for intact cores maintained at field moisture conditions and rewet via a simulated precipitation (n = 4, 4 and 4 for −1.5, −15, and −50 kPa pore water fractions, respectively), b simulated groundwater rise (n = 4, 4, and 3), and from cores subjected to antecedent drought and rewet via c simulated precipitation (n = 4, 3, and 4), d simulated groundwater rise (n = 4, 3, and 2), or from homogenized soil cores maintained at field moisture conditions and rewet via e simulated precipitation (n = 4, 4, and 3), f simulated groundwater rise (n = 4, 4, and 4), and from cores subjected to antecedent drought and rewet via g simulated precipitation (n = 4, 3, and 3), h simulated groundwater rise (n = 3, 3, and 3). Soil pore water was collected immediately following rewetting and post-rewetting incubation. Statistical summaries for Fig. 2 are included as Table 1. Mean and standard error values for compound classes shown are included in Supplementary Table 3
